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二维彩色多普勒超声（2D－CDF）在围产医学对产前胎儿、胎盘的监测中，越来越受到临床的重视和信赖。已成为不可缺少的产前检查手段。胎儿窘迫是目前剖宫产率持续上升的重要原因之一。ZD－CDF在产前探查宫内胎儿脐带绕颈（VCAN）具有重要诊断价值。为探讨如何提高ZD－CDF对发生
Two-dimensional color Doppler ultrasound (2D-CDF) in perinatal medicine on prenatal fetal, placental monitoring, more and more clinical attention and trust. Has become an indispensable means of prenatal care. Fetal distress is one of the important reasons for the continuous rise in cesarean section rate. ZD-CDF has an important diagnostic value in prenatal exploration of intrauterine fetal cord around the neck (VCAN). To explore how to improve ZD-CDF pairs happen